27.6.5.3 Breakpoints Buffer

The GDB Breakpoints buffer shows the breakpoints, watchpoints and
catchpoints in the debugger session. See Breakpoints in The
GNU debugger. It provides the following commands, which mostly apply
to the current breakpoint (the breakpoint which point is on):

SPC

Enable/disable current breakpoint (gdb-toggle-breakpoint). On
a graphical display, this changes the color of the dot in the fringe
of the source buffer at that line. The dot is red when the breakpoint
is enabled, and gray when it is disabled.

D

Delete the current breakpoint (gdb-delete-breakpoint).

RET

Visit the source line for the current breakpoint
(gdb-goto-breakpoint).

Mouse-2

Visit the source line for the breakpoint you click on.

When gdb-many-windows is non-nil, the GDB Breakpoints
buffer shares its window with the GDB Threads buffer. To switch from
one to the other click with Mouse-1 on the relevant button in
the header line. If gdb-show-threads-by-default is
non-nil, the GDB Threads buffer is the one shown by default.